Thin-film magnetic head that locally projects an element...

Details Thin-film magnetic head that locally projects an element... Thin-film magnetic head that locally projects an element...

2008-04-17

2011-12-06

Davis, David D (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

08072710

ABSTRACT:
A thin-film magnetic head comprises a reproducing element formed on an undercoat film on a head substrate surface, a recording element formed on the upper side of the reproducing element, and a heater formed on the upper or lower side of the reproducing element, the heater generating heat upon energization so as to project at least the reproducing element by thermal expansion toward a recording medium. A shield layer is formed between the reproducing element and the heater by a plurality of layers including at least first and second shield layers. In the first and second shield layers, the second upper shield layer located closer to the heater is formed by a material having a coefficient of thermal expansion smaller than that of the first shield layer located closer to the reproducing element.

REFERENCES:
patent: 7061726 (2006-06-01), Ohtomo et al.
patent: 7542246 (2009-06-01), Song et al.
patent: 2007/0211381 (2007-09-01), Kobayashi et al.
patent: 2007/0297097 (2007-12-01), Watanabe et al.
patent: A 2004-334995 (2004-11-01), None
patent: A 2006-66261 (2006-03-01), None
patent: A-2007-242189 (2007-09-01), None

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